package com.book.bookmanage.advice;

import com.book.bookmanage.annotation.NotRestController;
import com.book.bookmanage.utils.Result;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.core.MethodParameter;
import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.server.ServerHttpRequest;
import org.springframework.http.server.ServerHttpResponse;
import org.springframework.web.bind.annotation.RestControllerAdvice;
import org.springframework.web.servlet.mvc.method.annotation.ResponseBodyAdvice;

@RestControllerAdvice(basePackages = {"com.book.bookmanage.controller"})
public class GlobalResponseAdvice implements ResponseBodyAdvice<Object> {
    @Override
    public boolean supports(MethodParameter returnType, Class<? extends HttpMessageConverter<?>> converterType) {
        return !returnType.hasMethodAnnotation(NotRestController.class) && !returnType.getParameterType().isAssignableFrom(Result.class);
    }

    @Override
    public Object beforeBodyWrite(Object body, MethodParameter returnType, MediaType selectedContentType, Class<? extends HttpMessageConverter<?>> selectedConverterType, ServerHttpRequest request, ServerHttpResponse response) {
        if(returnType.getParameterType().isAssignableFrom(void.class)) {
            return Result.success();
        }
        if(!(body instanceof Result)) {
            if(body instanceof String) {
                ObjectMapper objectMapper = new ObjectMapper();
                try {
                    return objectMapper.writeValueAsString(Result.success(body));
                } catch (JsonProcessingException e) {
                    throw new RuntimeException(e);
                }
            }
            return Result.success(body);
        }
        return null;
    }
}
